Novel high-temperature-resistant small-hole tilting pad bearing

Abstract

The invention provides a novel high-temperature-resistant small-hole tilting pad bearing which is mainly composed of a bearing shell and a wire mesh structure, a tilting pad structure with an S-shaped spring flexible structure is adopted, a microgroove is engraved in each pad, and small holes are formed in the microgrooves to supply air to a working surface to form an air film. The left part and the right part of the bearing shell are integrally machined and formed through the electric spark technology and connected and fixed through cylindrical pins. Due to the fact that the throttler, the flow channel and the shell are integrally machined, the bearing has the characteristic of high temperature resistance. The metal wire mesh structure is embedded in the gap between the bearing body and the tile block, provides flexible support for the tile block, and can keep stable performance at high temperature and low temperature. Therefore, the bearing structure provided by the invention can provide a relatively high damping characteristic for the bearing and has the characteristic of high temperature resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of air-floating bearings, and in particular to a novel high-temperature resistant small-hole tilting pad bearing which is integrated with a tilting pad by using a throttling method of small holes and micro grooves, a metal mesh structure and an S-spring damping structure, and is divided into left and right parts, so that the bearing has greater damping and high-temperature resistance. Background Art

[0002] Air bearings have many characteristics such as high speed, low loss, compact structure, and maximum design freedom. They can improve the efficiency and stability of various equipment and are widely used in aerospace, environmental protection, automobile, petrochemical, energy and power industries. However, since the lubricating medium is gas, it has a lower viscosity, which is lower than the viscosity of the lubricating oil of the sliding bearing lubricating medium. As a result, the traditional rigid gas bearing structure has a higher cross-coupling stiffness, which causes the instability of the rotor. The flexible tilting pad structure can reduce the cross stiffness of the bearing and improve the stability of the rotor system. However, due to the inherent characteristics of the lubricating medium, it still has a low load-bearing capacity and damping performance.

[0003] Air bearings are one of the key components for realizing the S-CO2 power cycle. In view of the problems that gas bearings generate very large friction and wear during the start-up and stop phases of large turbine units, as well as the low bearing capacity, low rigidity, small damping, and poor stability of gas bearings, dynamic and static pressure hybrid bearings have the advantages of both dynamic pressure bearings and static pressure gas bearings, which can reduce wear during the start-up and stop phases and improve the bearing capacity. The present invention structurally adopts a throttling method of small holes and micro grooves and is processed integrally with the tilting pads. The damping structure of the "S"-shaped spring and metal wire mesh reduces the complexity of the bearing system and improves the reliability of the entire system. The bearing as a whole can adapt to high temperature environments, avoiding the possibility of glue shedding and failure of porous tilting pad bearings under high temperature operation, so as to solve the problem of support components operating at high temperatures in S-CO2 turbine machinery. Summary of the invention

[0004] Based on the above background technology, in order to improve the heat resistance of traditional gas bearings, this paper proposes a new type of high-temperature resistant small-hole tilting pad bearing which adopts a metal wire mesh structure and is made of a left throttle, a flow channel and a shell in one piece.

[0005] The technical solution of the present invention is as follows:

[0006] The novel high temperature resistant small hole tilting pad bearing of the present invention is mainly composed of two main components: a bearing housing and a metal wire mesh.

[0007] Furthermore, the tilting pad structure in the bearing housing is composed of 4 pads and 8 "S" spring structures. The bearing as a whole is divided into two symmetrical parts, each of which is integrated through electric spark wire cutting.

[0008] Furthermore, the "S" spring structure provides flexible support for the bearing, and the eight "S" spring structures are combined in pairs and symmetrically distributed around the bearing.

[0009] Furthermore, the wire mesh is formed by stamping and embedded in the gap between the bearing body and the pad to provide damping performance for the bearing. The wire mesh can also be replaced by other materials that provide damping.

[0010] Furthermore, each tile is supported by two "S" spring structures (1), with three long micro-grooves on the inner side, and two small holes are punched on each micro-groove, which supply air to the working surface to form an air film, wherein the number of micro-grooves and small holes can be changed.

[0011] Furthermore, three M6 cylindrical threaded holes are distributed under each tile microgroove, and the edges of the cylindrical threaded holes and the working surface form a thinner hole wall to facilitate drilling of smaller holes.

[0012] Furthermore, the cylindrical threaded hole serves as a gas supply passage, and the cylindrical gas flow passage threaded hole is sealed by wrapping a screw plug with raw tape, and a PT1 / 4 pneumatic joint is used on the back of the bearing to connect the cylindrical gas flow passage threaded holes on the bearing to form a gas supply passage.

[0013] Furthermore, the bearing cover and the bolts provide axial fixation, and may also be fixed in a variety of other ways.

[0014] Furthermore, the left and right parts of the bearing housing are connected and fixed by a cylindrical pin, and can also be fixed by other various methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall appearance of the present invention.

[0016] Figure 2 It is a schematic diagram of the overall internal structure of the present invention.

[0017] Figure 3 It is an exploded view of the present invention.

[0018] Figure 4 It is a schematic structural diagram of the bearing housing (1) of the present invention.

[0019] Figure 5 A partial enlarged view of the micro groove (7) of the bearing housing.

[0020] Figure 6 It is a schematic structural diagram of the bearing cover (4) of the present invention.

[0021] Figure 7 It is a schematic structural diagram of the metal wire mesh (2) of the present invention.

[0022] Figure 8 It is a schematic structural diagram of the cylindrical pin (3) of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings. However, it should be understood that the following specific embodiments are only preferred embodiments of the present invention and should not be construed as limiting the present invention.

[0024] like Figure 1 , Figure 3 and Figure 7 As shown, the bearing cover (4) and the bearing housing (1) are connected by bolts (5), and the wire mesh structure (2) is annular and embedded in the annular area between the bearing body and the shoe.

[0025] like Figure 2 , Figure 3 and Figure 8 As shown, (1) is a bearing housing, (2) is a metal mesh structure, (3) is a cylindrical pin, (4) is a bearing cover, (5) is a bolt, (6) is a tile, (7) is a micro groove, (8) is a small hole, (9) is a threaded hole, (10) is a screw plug, (11) is an S spring structure, and (12) is a pneumatic joint. The left and right parts of the bearing housing (1) are integrally processed by electric spark technology and connected by two cylindrical pins (3).

[0026] like Figure 4 As shown, three cylindrical threaded holes (9) are distributed under the microgrooves of each bearing block (6). The cylindrical gas flow channel threaded holes (9) are sealed with a screw plug (10) wrapped with a raw tape, and a pneumatic joint (12) is used on the back of the bearing to connect the cylindrical gas flow channel threaded holes (9) on the bearing to form an air supply passage.

[0027] like Figure 5 and Figure 6 As shown, the bearing housing (1) has a total of 4 pads (6), each of which has 2 "S" springs (11). Each pad has three circumferentially distributed microgrooves (7), and each microgroove has two small holes (8).

Claims

1. A new type of high temperature resistant small hole tilting pad bearing, characterized by: The high temperature resistant small hole tilting pad bearing comprises: a bearing housing (1), a metal mesh (2), a cylindrical pin (3), a bearing cover (4), and a bolt (5). The tilting pad structure in the bearing housing (1) is composed of four pads (6) and eight "S" spring structures (11). The bearing as a whole is divided into two symmetrical parts, each of which is integrated by electric spark wire cutting. The "S" spring structure (11) provides flexible support for the bearing. The eight "S" spring structures (11) are combined in pairs and symmetrically distributed around the bearing. The metal mesh (2) is embedded in the gap of the bearing body. The "S" spring structure (11) and the metal mesh (2) both provide the bearing with higher damping performance.

2. According to claim 1, it is characterized in that: The metal wire mesh (2) is formed by stamping and embedded in the gap between the bearing body and the shoe. The metal wire mesh (2) can also be replaced by other materials that provide damping.

3. According to claim 1, it is characterized in that: Each tile (6) is supported by two "S" spring structures (1) and has three long strip microgrooves (7) on the inner side. Two small holes (8) are punched on each microgroove (7). The microgroove (7) is 18 mm long and 45 μm deep. The inner diameter of the small hole (8) is 0.2 mm. The small hole (8) supplies air to the working surface to form an air film. The number of microgrooves and small holes can be changed.

4. According to claim 1, it is characterized in that: Three M6 cylindrical threaded holes (9) are distributed under the microgrooves of each bearing block (6). On the one hand, the edges of the cylindrical threaded holes (9) and the working surface form a thinner hole wall, which is convenient for drilling a smaller hole (8) in diameter. On the other hand, they serve as gas supply passages. The cylindrical gas flow passage threaded holes (9) are sealed by wrapping a raw tape with a screw plug (10). A PT1 / 4 pneumatic joint (12) is used on the back of the bearing to connect the cylindrical gas flow passage threaded holes (9) on the bearing to form a gas supply passage.

5. According to claim 1, it is characterized in that: The bearing cover (4) and the bolt (5) provide axial fixation, and can also be fixed in various other ways.

6. According to claim 1, it is characterized in that: The symmetrical left and right parts of the bearing housing (1) are connected and fixed by two cylindrical pins (3), and can also be fixed by other various methods.

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